Today's Headlines: An Atlas of Upward Mobility Shows Paths Out of Poverty

The Uphill Battle to Better Regulate Formaldehyde |
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Top News
The former home of the Polk family in Bellwood, Ill.  The fatal shooting of Latonya Polk's husband there prompted her to move away with her two children in search of a safer place.

The Upshot

An Atlas of Upward Mobility Shows Paths Out of Poverty

By DAVID LEONHARDT, AMANDA COX and CLAIRE CAIN MILLER

A decades-old effort found that moving poor families to better neighborhoods did little to help them. A new look at the data suggests the opposite.

Irvin Fox, working at StyleCraft Cabinets in Terre Hill, Pa., depends on wood glues, which contain formaldehyde.
The Uphill Battle to Better Regulate Formaldehyde

By ERIC LIPTON and RACHEL ABRAMS

E.P.A. rules aim to address dangerous fumes from the chemical, often used in furniture, but industry forces and others see government overreach.

.  Document: The Formaldehyde Fight
A Chinese team returned from Antarctica last month. China has chosen a site for a fifth research station on the continent.
China, Pursuing Strategic Interests, Builds Presence in Antarctica

By JANE PERLEZ

As China spends more on the Antarctic, and the early occupiers, the United States and Australia, face stagnant budgets, a debate rages about what China wants.

For more top news, go to NYTimes.com »
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Editors' Picks

U.S. | Retro Report

A Flame Retardant That Came With Its Own Threat to Health

By CLYDE HABERMAN

A chemical added to children's pajamas was meant to save lives, but in the 1970s scientists concluded that it was a mutagen, a gene-altering agent.

. Video  Video: Safety on Fire

OPINION | Op-Ed Contributor

Stand Your Ground Makes No Sense

By ROBERT J. SPITZER

Despite what supporters say, these laws increase violence and mayhem.

QUOTATION OF THE DAY

"The data show we can do something about upward mobility. Every extra year of childhood spent in a better neighborhood seems to matter."

RAJ CHETTY, an author of a study that suggests geography plays a large role in determining which children escape poverty.

Today's Videos
Video Video: 'Thousands of Freddie Grays'

Women from the Sandtown-Winchester area of Baltimore discuss the problems plaguing the neighborhood where Freddie Gray was raised.

Video Video: Bill Cunningham | Fashion and Art

The fashion world could use the energy displayed during the 10-day preview of the new Whitney Museum of American Art.

For more video, go to NYTimes.com/Video »
World
Tents and other supplies for earthquake victims at the airport in Kathmandu on Sunday.
Nepal's Bureaucracy Is Blamed as Earthquake Relief Supplies Pile Up

By GARDINER HARRIS

Western authorities said that supplies for earthquake victims have been piling up at the airport and in warehouses in Kathmandu because of bureaucratic interference.

Staffan de Mistura, left, the United Nations envoy for Syria, meeting in Damascus in February with the Syrian deputy foreign minister, Faisal Mekdad, in an effort to halt fighting in Aleppo.
Iran Nuclear Talks Open a Tangled Path to Ending Syria's War

By SOMINI SENGUPTA

World leaders are linking the nuclear talks with Iran to the possibility for peace in Syria, but Staffan de Mistura, the United Nations envoy who is pursuing a resolution, has a loud chorus of critics.

Ed Miliband, the leader of the Labour Party, arrived for a campaign event in London last week. Both he and his main rival, Prime Minister David Cameron, are from Britain's elite.
David Cameron and Ed Miliband Enter Final Straight in British Election

By STEVEN ERLANGER

Mr. Cameron, the Conservative leader, and Mr. Miliband, Labour's leader, have pulled their parties back to the past in a personal and often poisonous campaign.

For more world news, go to NYTimes.com/World »
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U.S.
A police officer outside the Muhammad Art Exhibit on Sunday night where two gunmen opened fire in Garland, Tex.
Police in Texas Kill Gunmen at Exhibit Defying Islam

By LIAM STACK

Two assailants in Garland, Tex., shot a private security guard and were, in turn, killed by the police at an event hosted by an anti-Islam group that featured cartoons of the Prophet Muhammad.

National Guard soldiers boarding a truck in Baltimore on Sunday.
In Baltimore, National Guard Pullout Begins as Citywide Curfew Is Lifted

By ALAN BLINDER, RICHARD FAUSSET and NIKITA STEWART

Baltimore residents prepared to resume the more familiar rhythms of their lives as days passed without new bouts of widespread rioting and as the National Guard began to pull its troops from the city.

Long-Term Data on Complications Adds to Criticism of Contraceptive Implant

By RONI CARYN RABIN

Thousands of women who claim they were seriously injured by the implant Essure are urging the Food and Drug Administration to take the device off the market.

For more U.S. news, go to NYTimes.com/US »
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Politics
Ben Carson, who is running for president, at the Conservative Political Action Conference in National Harbor, Md., on Feb. 26.
Ben Carson Says He'll Seek 2016 G.O.P. Nomination

By TRIP GABRIEL

Positioning himself as an outsider in a crowded Republican presidential field, the retired neurosurgeon planned a formal announcement on Monday.

Ben Carson, a retired neurosurgeon, at the Iowa Freedom Summit in January.
Ben Carson on the Issues

By GERRY MULLANY

An acknowledged novice on foreign affairs, the retired doctor has staked out stronger positions on health care, immigration and same-sex marriage.

Gov. Scott Walker of Wisconsin, who likes to boast of his coupon-clipping frugality.
G.O.P. Hopefuls Now Aiming to Woo the Middle Class

By JEREMY W. PETERS

The candidates who hope to be the Republican presidential nominee in 2016 are trying to create a very different set of associations than the last three.

For more political news, go to NYTimes.com/Politics »
Business
United's first-class and business fliers get Rhapsody, its high-minded in-flight magazine, seen here at its office in Brooklyn.
Rhapsody, a Lofty Literary Journal, Perused at 39,000 Feet

By ALEXANDRA ALTER

For its front-cabin passengers, United Airlines is turning Rhapsody into the Paris Review of the air, attracting authors like Joyce Carol Oates and Anthony Doerr.

Shane Smith, chief executive of Vice, which has signed programming deals worth hundreds of millions of dollars with mainstream media companies that covet its audience.
As Vice Moves More to TV, It Tries to Keep Brash Voice

By SYDNEY EMBER and ANDREW ROSS SORKIN

Vice has signed deals worth hundreds of millions of dollars with established TV companies that are eager to engage its young, male audience. But will it have to play by different rules?

Dave Goldberg and his wife at a tech conference in 2013. Both often left their offices at 5:30 to eat dinner with their children.
Dave Goldberg Was Lifelong Women's Advocate

By JODI KANTOR

The late chief executive of SurveyMonkey and husband of the Facebook executive Sheryl Sandberg was raised around "woman power" and was an avid supporter of female achievement.

. Related Obituary
For more business news, go to NYTimes.com/Business »
Technology
Paul Allen last year. In 1975, he and Bill Gates built Microsoft's first software product.

Bits Blog

40 Busy Years Later, Paul Allen, a Microsoft Founder, Considers His Creation

By NICK WINGFIELD

Paul Allen, who founded Microsoft with Bill Gates 40 years ago, says the most daunting task the company faces is getting momentum in the mobile market.

. Microsoft (Yes, Microsoft) Has a Far-Out Vision
A search engine called Vurb, meant for mobile phones, aims to take several common queries and group them for users.
Start-Ups Try to Challenge Google, at Least on Mobile Search

By CONOR DOUGHERTY

Venture capitalists, intimidated by Google search for a decade, have begun investing hundreds of millions in new search efforts for mobile phones.

Peter Hamby, a CNN political reporter, has been hired by the vanishing-message app Snapchat to lead its nascent news division.

News Analysis

Campaign Coverage via Snapchat Could Shake Up the 2016 Elections

By JONATHAN MAHLER

Will 2016 be the Snapchat election? The question arises after last week's reports that Snapchat, America's fastest-growing smartphone app, had hired a political reporter for CNN to lead its nascent news division.

For more technology news, go to NYTimes.com/Technology »
Sports
Magomed Abdusalamov, a Russian former heavyweight boxer, is bedridden as result of injuries sustained in his November 2013 fight against Mike Perez at Madison Square Garden.
Meet Mago, Former Heavyweight

By DAN BARRY

For Magomed Abdusalamov, 34, also known as the Russian Tyson, life was never the same after he lost for the first time in his 19th professional fight.

Sports of The Times

Mayweather Wins, Preens and Is Booed

By MICHAEL POWELL

Cognitive dissonance was on display in Las Vegas. Fans bought mounds of Floyd Mayweather swag all week, but he was booed at the arena, while Manny Pacquiao got cheers.

The Bulls' Michael Jordan taking The Shot, as it has come to be known, over the Cavaliers' Craig Ehlo to clinch their 1989 first-round playoff series.

On Pro Basketball

Decades After a Famous Shot, the Fall Guy Is Still Recovering

By HARVEY ARATON

Craig Ehlo is remembered for failing to stop Michael Jordan's winning shot in the final seconds of the first round of the Eastern Conference playoffs in 1989. But he has triumphed in other ways.

For more sports news, go to NYTimes.com/Sports »
Arts
Orville Wright lands one of the early Wright gliders badly, as his brother Wilbur watches.

Books of The Times

Review: 'The Wright Brothers' by David McCullough

By JANET MASLIN

This concise, exciting and fact-packed book gives a portrait of the aviation pioneers with detail so granular you may wonder how it was all collected.

JaQuavis and Ashley Coleman, who fell in love as teenagers in Flint, Mich., and whose novels chronicle a hardscrabble world they know well.

T Magazine

Ashley and JaQuavis Coleman: Kiss Kiss Bang Bang

By JODY ROSEN

Urban fiction, or street lit, has been snubbed by the publishing industry and scorned by black intellectuals. Yet these authors may just be the most successful literary couple in America.

Electronic Africa The lineup included shimmying dancers and vocalists.
Review: 'Electronic Africa' Pushes Dance Rhythms to a Breakneck Speed

By JON PARELES

Nozinja, a South African producer and D.J., was the headliner for the first show of this year's Red Bull Music Academy Festival and set a frenetic pace.

For more arts news, go to NYTimes.com/Arts »
New York
Demetrius Blackwell, 35, was arraigned in Queens County Criminal Court on Sunday in the shooting of an officer.
Queens Man Charged With Assault and Attempted Murder in Shooting of Officer

By J. DAVID GOODMAN

Demetrius Blackwell was also arraigned on charges of weapons possession. The officer, Brian Moore, remained in critical condition.

Gov. Chris Christie of New Jersey spoke in April at the First in the Nation Republican Leadership Summit in Nashua, N.H.
Christie's Grip on Republican Politics in New Jersey Shows Signs of Slipping

By ALEXANDER BURNS

Even a gentle inching away from Gov. Chris Christie would represent a significant departure for New Jersey Republicans, who have tied their fortunes to the governor's since 2009.

Gov. Andrew M. Cuomo pushed new ethics measures after the arrest in January of Sheldon Silver.
Effort to Strip Pensions From Corrupt New York Officials Stalls

By THOMAS KAPLAN

Assembly Democrats delayed approval of a proposed constitutional amendment after unions representing public workers raised concerns about its scope.

For more New York news, go to NYTimes.com/NewYork »
Obituaries
Joseph Lechleider
Joseph Lechleider, a Father of the DSL Internet Technology, Dies at 82

By STEVE LOHR

Mr. Lechleider helped invent DSL technology, which enabled phone companies to offer high-speed web access over their infrastructure of copper wires.

For more obituaries, go to NYTimes.com/Obituaries »
Op-Ed

Op-Ed Columnist

Restoring Faith in Justice

By CHARLES M. BLOW

Charges against six Baltimore police officers may be one step in repairing the system.

. Columnist Page

Op-Ed Columnist

Race, Class and Neglect

By PAUL KRUGMAN

The many casualties of inequality can be helped by providing more resources and opportunities, which we can afford.

. Columnist Page

Op-Ed Contributor

Insuring for Disaster

By JEFFREY D. SACHS

We can't prevent tragedies like the Nepal quake, but we can find a better way to help.

For more opinion, go to NYTimes.com/Opinion »

ON THIS DAY

On May 4, 1970, Ohio National Guardsmen opened fire on antiwar protesters at Kent State University, killing four students and wounding nine others.